308 Magazine - What gun does this belong to???

Cleaning out my garage and ran across this mag. Seems to be a 5 round 308 mag (308's go in and out easily.) Any idea what gun it goes with? There are no markings on it.

Looks like a g3 mag.

I'll be darned, I do believe 6.5X47Lapua won. Thanks man!

Yeah. Was gonna say CETME or G3.

Lemme know if you don't need it. I have a G3. I have plenty of 20 round mags but not 1 5 rounder. Earl